The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.
A.stood for | B.called for | C.paid for | D.contributed to |
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The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.
A.stood for | B.called for | C.paid for | D.contributed to |